Abstract: Compared with AC microgrid,DC microgrid has the advantages of few energy conversion devices,simple control structure,no consideration on eddy current and reactive power,and so on. It has become a research hotspot in the field of efficient utilization of distributed energy resources (DERs) and flexible DC distribution. However,most of the research focuses on the application and development of DC microgrids in future residential and intelligent build- ings,as well as the optimization and coordination of DERs in DC microgrids,which lacks in-depth research on the DC microgrid system for CBM ground extraction with the application background and self load characteristics of the energy industry. Combined with the power network for coalbed methane (CBM) ground extraction and electrical load charac- teristics,the DC microgrid hierarchical topology system for CBM ground extraction was proposed in this paper. In addi- tion,the key technologies to build DC microgrid system for CBM ground extraction were summarized and analyzed,and the feasibility of implementing a DC microgrid system for CBM ground extraction was analyzed and overviewed.